Ortofon tonearms ,Static and Dynamic - Difference?

I see there are 4 new Ortofon tonearms.

Static tone arms: AS-212-S and AS-309-S
Dynamic tone arms: RS-212-D and RS-309-D


What are the differences sonically and in general use of the Static and Dynamic versions of each??
I just put a 309D on My TW accustic Raven one, on the designers recommendation, he uses one on his. I am very pleased, admittedly, changing from a Jelco Vivid, it should be much better. It is more than a small step up in quality, particularly dynamics, it sounds like the volume has been increased, but also imaging, sounstage depth, a big improvement. The TW designer thinks on that deck, the Ortofon is only a few % points behind the Grahams, Schroeders etc. Before anyone gets upset by that comment, it's Thomas's, not mine. In general though, it is well made and very good value
To Agondgd,
Was interesting to read your remark as to
"static Ortofons are intented for the heavy SPU range of cartridges and Dynamic for a wider group of brands and models."
Then you stated it is vice versa. What interests me - I spoke with LDorio@ortofon today and he indicated exactly what you said initially - static for SPU and Dynamic for the rest.
Do you still think Dynamic has more narrow field of applications so to speak?
Thank you
I have an AS-309S arm on my TW Akustic Raven One, installed by Jeff Catalano of Highwater Sound in NYC-it was his demo arm and I got a good deal on it. Sounds very good-very clear and dynamic, picks up very little distortion, a little bit towards the warm side but then my whole system is geared that way because I'm very sensitive to steely treble. I had a VPI TT before the Raven, it had an Audioquest arm and this setup is leaps and bounds beyond it in every parameter. And its my understanding too that the designer uses Ortofon arms on the TW Austic turntables. Ortofon has probably been a little more popular in Europe since its an old Danish company.
I read that another thing to consider is how to get the counter weight as close to the arm pivot point as possible. I don't know the technical reason for this, but if all else is equal, the closer the weight to the pivot, the better the arm will sound. Perhaps an engineer can explain the reasons which I think have to do with how quickly the arm reacts to vertical movement.